/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see <http://www.gnu.org/licenses/>.
 */
package com.jrelax.third.captcha.filter.library;

public class MarbleImageOp extends AbstractTransformImageOp {

	double scale;
	double amount;
	double turbulence;
	double[] tx;
	double[] ty;
	double randomX;
	double randomY;
	
	public MarbleImageOp() {
		scale = 15;
		amount = 1.1;
		turbulence = 6.2;
		randomX = 256 * Math.random();
		randomY = 256 * Math.random();
	}
	
	public double getScale() {
		return scale;
	}

	public void setScale(double scale) {
		this.scale = scale;
	}

	public double getAmount() {
		return amount;
	}

	public void setAmount(double amount) {
		this.amount = amount;
	}

	public double getTurbulence() {
		return turbulence;
	}

	public void setTurbulence(double turbulence) {
		this.turbulence = turbulence;
	}

	@Override
	protected synchronized void init() {
		tx = new double[256];
		ty = new double[256];
		for (int i = 0; i < 256; i++) {
			double angle = 2 * Math.PI * i * turbulence / 256;
			tx[i] = amount * Math.sin(angle);
			ty[i] = amount * Math.cos(angle);
		}
	}
	
	@Override
	protected void transform(int x, int y, double[] t) {
		int d = limitByte((int) (127 * (1 + PerlinNoise.noise2D(((double)x) / scale + randomX, ((double)y) / scale + randomY))));
		t[0] = x + tx[d];
		t[1] = y + ty[d];
	}
	
	protected void filter2(int[] inPixels, int[] outPixels, int width, int height) {
		for (int y = 0; y < height; y++) {
			for (int x = 0; x < width; x++) {
				int pixel = limitByte((int) (127 * (1 + PerlinNoise.noise2D(((double)x) / scale + randomX, ((double)y) / scale + randomY))));
				outPixels[x + y * width] = (limitByte((int)255) << 24) | (limitByte((int)pixel) << 16) | (limitByte((int)pixel) << 8) | (limitByte((int)pixel));				
			}
		}
	}
	

}
